Merge branch 'update-example-ip-addresses-as-per-rfc5737' into 'master'

Update example IPs as per RFCs 5737 & 1918

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/124956



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Reviewed-by: Achilleas Pipinellis <axil@gitlab.com>
Co-authored-by: Katrin Leinweber <kleinweber@gitlab.com>